Joined mid and fid indexing operations
Unified indexing API

 - Merged mid/fid operations
 - Added update_fmid
 - Modified mapistore backend function parameters
Added fmid allocation functions to the indexing backend
Added fmid allocation testing
Merge branch 'cperez/indexing' into jgarcia/use_fmid_from_indexing

Conflicts:
	test/openchange_test_suite.c
create mapistore_indexing_* functions façade of allocate_fids ones
use new functions to get new folder ids
change openchangedb_create_mailbox so we pass the fid instead of be created inside the function
link unittest against mapi library
be able to compile unittest without doing make install of openchange

Use libmapi.so.2.0 compiled on the parent directory
backend definition uses new indexing_backend
avoid warnings of redefined _GNU_SOURCE
Merge pull request #6 from Zentyal/jgarcia/use_fmid_from_indexing

Indexing backend and integration with openchangedb